leaning towards the 2000+ is just fine in my book, it is generally not the most cost-effective solution to go with the fastest processor
your choice of motherboard seems to be just fine, however, if it were my decision, i would probably look at a board from msi, gigabyte, or soltek as they also provide very acceptable products.
for your ram, i recommend crucial or mushkin for high quality, and dependability. other acceptable companies that i havent personally tried are corsair and sumsung. also, if you are going with a kt333 chipset, be sure to look into pc2700 ram over pc2100.
i would not recommend keeping the geforce2 as it will be a major bottleneck in your system. although, you may find it wise to keep it until the radeon 9700 comes out. the current lineup of cards should drop prices suitably, leaving you with much nicer choices..or you could always drop the dough for the 9700 itself.
i am currently using a radeon 8500le, which is a steal at just under $100, on a gigabyte 7vrxp kt333 motherboard.